Nhound

Fix
* **inotion:** Mention in callout does not have to be a user ([28](https://github.com/worldr/nhound/issues/28)) ([`3954242`](https://github.com/worldr/nhound/commit/3954242eec2528a70dad25218a1f5c2318528a4e))

Feature
* **callouts:** With documentation and tests ([26](https://github.com/worldr/nhound/issues/26)) ([`9dd921b`](https://github.com/worldr/nhound/commit/9dd921bd5aaa4c0af59d361ccbc456c5adc763a3))
* **notion:** Added notion API and SMTP auth. ([21](https://github.com/worldr/nhound/issues/21)) ([`a1e8c96`](https://github.com/worldr/nhound/commit/a1e8c96359a7e32bac37879c220617725b2bb63d))
* Initial upload ([1](https://github.com/worldr/nhound/issues/1)) ([`ad00aee`](https://github.com/worldr/nhound/commit/ad00aee4676291dcb02955030aafddea4c1e8c14))